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Table 1 Grading system of the modified Matsumoto’s classification

From: Characteristics of cervical sagittal parameters in healthy cervical spine adults and patients with cervical disc degeneration

Decrease in signal intensity of intervertebral disc
0: As bright as or slightly less bright than healthy disc
1: Markedly darker than healthy disc
2: No signal
Posterior disc protrusion
0: No protrusion
1: Disc material protruding beyond the posterior margin of the vertebral body without cord compression
(less than one-third of dural sac)
2: Beyond vertebral body with cord compression (more than one-third of dural sac)
Disc space narrowing
0: 100–75% of height of upper healthy disc
1: 75–50% of height of upper healthy disc
2: Less than 50% of height of upper healthy disc